Principal, private equity group
Age: 34
Klimczak, who graduated at the top of his class at Harvard Business School, could have written his ticket to almost any Wall Street firm. His decision to go to Blackstone was turned into a case study on how to make employment decisions. Now he specializes in energy deals and helps the firm recruit the best and the brightest. "They identify the same opportunity that I did when I came out of HBS," he says. "It is the expectation, rather than the hope, that we take on significant responsibility at a very young age." To wit: Klimczak sits on a total of eight boards, which he describes as a unique and humbling experience.
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Last updated October 15 2010: 2:41 PM ET